package org.example.controller;


import lombok.extern.slf4j.Slf4j;
import org.example.comment.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class WenJianController {

    @Value("${reggie.path}")
    private String BathPath;

    /**
     * 文件上传
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile  file){
        //file 是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID重新生成文件名
        String fileName = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象
        File der = new File(BathPath);
        //判断当前目录是否存在
        if(!der.exists()){
            //创建目录
            der.mkdirs();
        }
        try{
            file.transferTo(new File((BathPath + fileName)));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        //输入流，通过输入流读取文件内容
        log.info(toString().concat("开始下载文件"));
        try{
            FileInputStream fileInputStream = new FileInputStream(new File(BathPath + name));
            //输出流，通过输出流将文件写回浏览器，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len = 0;
            while ((len = fileInputStream.read()) != -1){
                outputStream.write(len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
        }
        catch (Exception e){
            throw new RuntimeException(e);
        }
    }
}
